The invention provides a soundproofing material having excellent heat resistance, and, as a felt that is moldable into a soundproofing material at a low temperature, a felt which contains 10 mass % to 90 mass % of an unstretched thermoplastic resin fiber, and has a thickness of 0.05 mm to 100 mm, and an areal weight of 50 g/m.sup.2 to 2 kg/m.sup.2.

The invention provides a soundproofing material having excellent heat resistance, and, as a felt that is moldable into a soundproofing material at a low temperature, a felt which contains 10 mass % to 90 mass % of an unstretched thermoplastic resin fiber, and has a thickness of 0.05 mm to 100 mm, and an areal weight of 50 g/m.sup.2 to 2 kg/m.sup.2.